as far as i know, the value of dimension cant be changed while u save a drw to dxf. A dimn which is 100 in drw, will be 100 in dxf also. but yes, u can change the actual length. If ur proe drw scale is 0.5, then actual length of 100 size will be 50. If u want this actual length to be 50 (or 100) in dxf, then u can do it using config option - dxf_out_scale_views. If u set it YES, actual length in dxf will be 100 (means ur dxf will be 1:1). If u set it NO (which is default), actual length in dxf will be 50. But in both cases, the dimn will show 100 (the same as in proe drw file). Ankur.